can't change default search engine

I try to change the default search engine in the search bar (to Google) by following your instructions, including by deleting all the other available options, but every time I re-open Firefox, all the other search engines have re-appeared and the default engine is Yahoo, not Google.

I try to change the default search engine in the search bar (to Google) by following your instructions, including by deleting all the other available options, but every time I re-open Firefox, all the other search engines have re-appeared and the default engine is Yahoo, not Google.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

Do not click the Reset button on the Safe mode start window or otherwise make changes.

Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do not click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
If you do not keep changes after a restart then see:
*http://kb.mozillazine.org/Preferences_not_saved